God's plan for enlarging His kingdom is so simple - one person telling another about the Savior. Yet we're busy and full of excuses. Just remember someone's eternal destiny is at stake. The joy you'll have when you meet that person in heaven will far exceed any discomfort you felt in sharing the gospel.
I was about to get a degree in economics when I accepted that I'd be a lousy businessman and if I didn't give acting a try I'd regret it for the rest of my life.